期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 372, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.132657
关键词
SnO2 nanowires; Gas sensors; Self-assembled monolayers; Surface functionalization; Femtosecond laser irradiation
资金
- Deutsche Forschungsgemeinschaft (DFG) [HA 2952/10-1]
- Korea Institute for Advancement of Technology, Republic of Korea [P066500002]
- Korea Polar Research Institute (KOPRI) - Ministry of Oceans and Fisheries (KOPRI project) [PE22900]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2021R1A2C1009790]
- Korea Polar Research Institute of Marine Research Placement (KOPRI) [PE22900] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study proposes an effective strategy to improve the selectivity and response of SnO2 nanowire-based gas sensors by adopting self-assembled monolayer functionalization and post-treatment femtosecond laser irradiation. The functionalization enhances gas selectivity by tuning surface chemical states, while the laser irradiation creates embossing surfaces and twin structures, improving gas adsorption and response.
This study proposes an effective strategy to improve the selectivity and response of SnO2 nanowire (NW)-based gas sensors. Self-assembled monolayer (SAM) functionalization of SnO2 NWs enhances the gas selectivity by tuning the surface chemical states. Different chemical moieties with alkyl and fluoroalkyl of the SAM molecules are adopted for the chemical affinities toward the corresponding target gas molecules. The alkyl and fluoroalkyl moieties show excellent selectivity toward CH4 and C3F8, respectively, owing to the strong chemical affinity between the moieties and gases. Post-treatment femtosecond (FS) laser irradiation with different laser fluences is applied to the SAM-functionalized SnO2 NW-based gas sensor. The FS laser-irradiated SnO2 NWs show an enhanced sensor response with higher resistance values and shorter response and recovery times compared to those of the pristine SnO2 NWs. Transmission electron microscopy analysis reveals that the FS laser irradiation induces the formation of embossing surface on the SnO2 NW, creating additional gas adsorption sites. Moreover, twin structures develop on the SnO2 NWs with increasing laser fluences. Electron energy loss spectroscopy analysis supports that the FS laser irradiation creates non-stoichiometric SnO and SnOx phases, providing O vacancies and improved response.
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